J/30 Class Association Forums J/30 Forum The Boat, Sails and Equipment Favorite motor oil?

It's been a long time, but I think I have a bottle in my garage. I'll check tonight. My mind recalls it just as 5W, but I think you're partly correct. It may be 5W 20. The 2QM runs cooler than the 2GM. This may be the reason. I believe the 2QM was really ment to be a generator engine.